Files Module Refactor

https://github.com/pyrocms/pyrocms/issues/2327

Files module refactored.
Models: 
```
use Pyro\Module\Files\Model\File;
use Pyro\Module\Files\Model\Folder;
```

Updated dependent plugins and field_types. Updated WYSIWYG module that used files module models. 

Cloud Manic was not tested yet. 

//TODO - model method call that doesn't exist now or in previous versions. 
https://github.com/appSYGNA/pyrocms/blob/8325f73b5b19ba08e7b7b3db47cea0b5be04ebbc/system/cms/modules/wysiwyg/controllers/files_wysiwyg.php#L67